A nurse transfers bone marrow donated from U.S. Air Force Tech. Sgt. Bruce Davis, 527th Space Aggressor Squadron radio frequency transmission supervisor, to a collection bag at Banner-University Medical Center in Tucson, Ariz., July 2015. Davis' marrow extraction took place at Banner UMC because one of its specialty services includes extensive cancer treatment. (U.S. Air Force photo by Airman 1st Class Chris Drzazgowski/Released)
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